/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.simonvt.numberpicker;

import java.text.DecimalFormatSymbols;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;

import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Bundle;
import android.text.InputFilter;
import android.text.InputType;
import android.text.Spanned;
import android.text.TextUtils;
import android.text.method.NumberKeyListener;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.util.TypedValue;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.LayoutInflater.Filter;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.view.accessibility.AccessibilityNodeInfo;
import android.view.accessibility.AccessibilityNodeProvider;
import android.view.animation.DecelerateInterpolator;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;

//import android.annotation.Widget;

/**
 * A widget that enables the user to select a number form a predefined range.
 * There are two flavors of this widget and which one is presented to the user
 * depends on the current theme.
 * <ul>
 * <li>
 * If the current theme is derived from {@link android.R.style#Theme} the widget
 * presents the current value as an editable input field with an increment button
 * above and a decrement button below. Long pressing the buttons allows for a quick
 * change of the current value. Tapping on the input field allows to type in
 * a desired value.
 * </li>
 * <li>
 * If the current theme is derived from {@link android.R.style#Theme_Holo} or
 * {@link android.R.style#Theme_Holo_Light} the widget presents the current
 * value as an editable input field with a lesser value above and a greater
 * value below. Tapping on the lesser or greater value selects it by animating
 * the number axis up or down to make the chosen value current. Flinging up
 * or down allows for multiple increments or decrements of the current value.
 * Long pressing on the lesser and greater values also allows for a quick change
 * of the current value. Tapping on the current value allows to type in a
 * desired value.
 * </li>
 * </ul>
 * <p>
 * For an example of using this widget, see {@link android.widget.TimePicker}.
 * </p>
 */
//@Widget
public class NumberPicker extends LinearLayout {

	/**
	 * The number of items show in the selector wheel.
	 */
	private static final int SELECTOR_WHEEL_ITEM_COUNT = 3;

	/**
	 * The default update interval during long press.
	 */
	private static final long DEFAULT_LONG_PRESS_UPDATE_INTERVAL = 300;

	/**
	 * The index of the middle selector item.
	 */
	private static final int SELECTOR_MIDDLE_ITEM_INDEX = SELECTOR_WHEEL_ITEM_COUNT / 2;

	/**
	 * The coefficient by which to adjust (divide) the max fling velocity.
	 */
	private static final int SELECTOR_MAX_FLING_VELOCITY_ADJUSTMENT = 8;

	/**
	 * The the duration for adjusting the selector wheel.
	 */
	private static final int SELECTOR_ADJUSTMENT_DURATION_MILLIS = 800;

	/**
	 * The duration of scrolling while snapping to a given position.
	 */
	private static final int SNAP_SCROLL_DURATION = 300;

	/**
	 * The strength of fading in the top and bottom while drawing the selector.
	 */
	private static final float TOP_AND_BOTTOM_FADING_EDGE_STRENGTH = 0.9f;

	/**
	 * The default unscaled height of the selection divider.
	 */
	private static final int UNSCALED_DEFAULT_SELECTION_DIVIDER_HEIGHT = 2;

	/**
	 * The default unscaled distance between the selection dividers.
	 */
	private static final int UNSCALED_DEFAULT_SELECTION_DIVIDERS_DISTANCE = 48;

	/**
	 * The resource id for the default layout.
	 */
	private static final int DEFAULT_LAYOUT_RESOURCE_ID = 0;

	/**
	 * Constant for unspecified size.
	 */
	private static final int SIZE_UNSPECIFIED = -1;

	/**
	 * Use a custom NumberPicker formatting callback to use two-digit minutes
	 * strings like "01". Keeping a static formatter etc. is the most efficient
	 * way to do this; it avoids creating temporary objects on every call to
	 * format().
	 */
	private static class TwoDigitFormatter implements NumberPicker.Formatter {
		final StringBuilder mBuilder = new StringBuilder();

		char mZeroDigit;
		java.util.Formatter mFmt;

		final Object[] mArgs = new Object[1];

		TwoDigitFormatter() {
			final Locale locale = Locale.getDefault();
			init(locale);
		}

		private void init(Locale locale) {
			mFmt = createFormatter(locale);
			mZeroDigit = getZeroDigit(locale);
		}

		@Override
		public String format(int value) {
			final Locale currentLocale = Locale.getDefault();
			if (mZeroDigit != getZeroDigit(currentLocale)) {
				init(currentLocale);
			}
			mArgs[0] = value;
			mBuilder.delete(0, mBuilder.length());
			mFmt.format("%02d", mArgs);
			return mFmt.toString();
		}

		private static char getZeroDigit(Locale locale) {
			// return LocaleData.get(locale).zeroDigit;
			return new DecimalFormatSymbols(locale).getZeroDigit();
		}

		private java.util.Formatter createFormatter(Locale locale) {
			return new java.util.Formatter(mBuilder, locale);
		}
	}

	private static final TwoDigitFormatter sTwoDigitFormatter = new TwoDigitFormatter();

	/**
	 * @hide
	 */
	public static final Formatter getTwoDigitFormatter() {
		return sTwoDigitFormatter;
	}

	/**
	 * The increment button.
	 */
	private final ImageButton mIncrementButton;

	/**
	 * The decrement button.
	 */
	private final ImageButton mDecrementButton;

	/**
	 * The text for showing the current value.
	 */
	private final EditText mInputText;

	/**
	 * The distance between the two selection dividers.
	 */
	private final int mSelectionDividersDistance;

	/**
	 * The min height of this widget.
	 */
	private final int mMinHeight;

	/**
	 * The max height of this widget.
	 */
	private final int mMaxHeight;

	/**
	 * The max width of this widget.
	 */
	private final int mMinWidth;

	/**
	 * The max width of this widget.
	 */
	private int mMaxWidth;

	/**
	 * Flag whether to compute the max width.
	 */
	private final boolean mComputeMaxWidth;

	/**
	 * The height of the text.
	 */
	private final int mTextSize;

	/**
	 * The height of the gap between text elements if the selector wheel.
	 */
	private int mSelectorTextGapHeight;

	/**
	 * The values to be displayed instead the indices.
	 */
	private String[] mDisplayedValues;

	/**
	 * Lower value of the range of numbers allowed for the NumberPicker
	 */
	private int mMinValue;

	/**
	 * Upper value of the range of numbers allowed for the NumberPicker
	 */
	private int mMaxValue;

	/**
	 * Current value of this NumberPicker
	 */
	private int mValue;

	/**
	 * Listener to be notified upon current value change.
	 */
	private OnValueChangeListener mOnValueChangeListener;

	/**
	 * Listener to be notified upon scroll state change.
	 */
	private OnScrollListener mOnScrollListener;

	/**
	 * Formatter for for displaying the current value.
	 */
	private Formatter mFormatter;

	/**
	 * The speed for updating the value form long press.
	 */
	private long mLongPressUpdateInterval = DEFAULT_LONG_PRESS_UPDATE_INTERVAL;

	/**
	 * Cache for the string representation of selector indices.
	 */
	private final SparseArray<String> mSelectorIndexToStringCache = new SparseArray<String>();

	/**
	 * The selector indices whose value are show by the selector.
	 */
	private final int[] mSelectorIndices = new int[SELECTOR_WHEEL_ITEM_COUNT];

	/**
	 * The {@link Paint} for drawing the selector.
	 */
	private final Paint mSelectorWheelPaint;

	/**
	 * The {@link Drawable} for pressed virtual (increment/decrement) buttons.
	 */
	private final Drawable mVirtualButtonPressedDrawable;

	/**
	 * The height of a selector element (text + gap).
	 */
	private int mSelectorElementHeight;

	/**
	 * The initial offset of the scroll selector.
	 */
	private int mInitialScrollOffset = Integer.MIN_VALUE;

	/**
	 * The current offset of the scroll selector.
	 */
	private int mCurrentScrollOffset;

	/**
	 * The {@link Scroller} responsible for flinging the selector.
	 */
	private final Scroller mFlingScroller;

	/**
	 * The {@link Scroller} responsible for adjusting the selector.
	 */
	private final Scroller mAdjustScroller;

	/**
	 * The previous Y coordinate while scrolling the selector.
	 */
	private int mPreviousScrollerY;

	/**
	 * Handle to the reusable command for setting the input text selection.
	 */
	private SetSelectionCommand mSetSelectionCommand;

	/**
	 * Handle to the reusable command for changing the current value from long
	 * press by one.
	 */
	private ChangeCurrentByOneFromLongPressCommand mChangeCurrentByOneFromLongPressCommand;

	/**
	 * Command for beginning an edit of the current value via IME on long press.
	 */
	private BeginSoftInputOnLongPressCommand mBeginSoftInputOnLongPressCommand;

	/**
	 * The Y position of the last down event.
	 */
	private float mLastDownEventY;

	/**
	 * The time of the last down event.
	 */
	private long mLastDownEventTime;

	/**
	 * The Y position of the last down or move event.
	 */
	private float mLastDownOrMoveEventY;

	/**
	 * Determines speed during touch scrolling.
	 */
	private VelocityTracker mVelocityTracker;

	/**
	 * @see ViewConfiguration#getScaledTouchSlop()
	 */
	private int mTouchSlop;

	/**
	 * @see ViewConfiguration#getScaledMinimumFlingVelocity()
	 */
	private int mMinimumFlingVelocity;

	/**
	 * @see ViewConfiguration#getScaledMaximumFlingVelocity()
	 */
	private int mMaximumFlingVelocity;

	/**
	 * Flag whether the selector should wrap around.
	 */
	private boolean mWrapSelectorWheel;

	/**
	 * The back ground color used to optimize scroller fading.
	 */
	private final int mSolidColor;

	/**
	 * Flag whether this widget has a selector wheel.
	 */
	private final boolean mHasSelectorWheel;

	/**
	 * Divider for showing item to be selected while scrolling
	 */
	private final Drawable mSelectionDivider;

	/**
	 * The height of the selection divider.
	 */
	private final int mSelectionDividerHeight;

	/**
	 * The current scroll state of the number picker.
	 */
	private int mScrollState = OnScrollListener.SCROLL_STATE_IDLE;

	/**
	 * Flag whether to ignore move events - we ignore such when we show in IME
	 * to prevent the content from scrolling.
	 */
	private boolean mIngonreMoveEvents;

	/**
	 * Flag whether to show soft input on tap.
	 */
	private boolean mShowSoftInputOnTap;

	/**
	 * The top of the top selection divider.
	 */
	private int mTopSelectionDividerTop;

	/**
	 * The bottom of the bottom selection divider.
	 */
	private int mBottomSelectionDividerBottom;

	/**
	 * The virtual id of the last hovered child.
	 */
	private int mLastHoveredChildVirtualViewId;

	/**
	 * Whether the increment virtual button is pressed.
	 */
	private boolean mIncrementVirtualButtonPressed;

	/**
	 * Whether the decrement virtual button is pressed.
	 */
	private boolean mDecrementVirtualButtonPressed;

	/**
	 * Provider to report to clients the semantic structure of this widget.
	 */
	private SupportAccessibilityNodeProvider mAccessibilityNodeProvider;

	/**
	 * Helper class for managing pressed state of the virtual buttons.
	 */
	private final PressedStateHelper mPressedStateHelper;

	/**
	 * The keycode of the last handled DPAD down event.
	 */
	private int mLastHandledDownDpadKeyCode = -1;

	//@XIYILI
	private TextView mValueIndicator;
	private String mIndicator = "";

	private Paint mMiddleSelectorWheelPaint;

	private int mFirstSelectorTopOffset;

	public CharSequence getIndicator() {
		return mValueIndicator.getText();
	}
	public void setIndicator(CharSequence indicator) {
		mValueIndicator.setText(indicator);
	}

	/**
	 * Interface to listen for changes of the current value.
	 */
	public interface OnValueChangeListener {

		/**
		 * Called upon a change of the current value.
		 *
		 * @param picker The NumberPicker associated with this listener.
		 * @param oldVal The previous value.
		 * @param newVal The new value.
		 */
		void onValueChange(NumberPicker picker, int oldVal, int newVal);
	}

	/**
	 * Interface to listen for the picker scroll state.
	 */
	public interface OnScrollListener {

		/**
		 * The view is not scrolling.
		 */
		public static int SCROLL_STATE_IDLE = 0;

		/**
		 * The user is scrolling using touch, and his finger is still on the screen.
		 */
		public static int SCROLL_STATE_TOUCH_SCROLL = 1;

		/**
		 * The user had previously been scrolling using touch and performed a fling.
		 */
		public static int SCROLL_STATE_FLING = 2;

		/**
		 * Callback invoked while the number picker scroll state has changed.
		 *
		 * @param view The view whose scroll state is being reported.
		 * @param scrollState The current scroll state. One of
		 *            {@link #SCROLL_STATE_IDLE},
		 *            {@link #SCROLL_STATE_TOUCH_SCROLL} or
		 *            {@link #SCROLL_STATE_IDLE}.
		 */
		public void onScrollStateChange(NumberPicker view, int scrollState);
	}

	/**
	 * Interface used to format current value into a string for presentation.
	 */
	public interface Formatter {

		/**
		 * Formats a string representation of the current value.
		 *
		 * @param value The currently selected value.
		 * @return A formatted string representation.
		 */
		public String format(int value);
	}

	/**
	 * Create a new number picker.
	 *
	 * @param context The application environment.
	 */
	public NumberPicker(Context context) {
		this(context, null);
	}

	/**
	 * Create a new number picker.
	 *
	 * @param context The application environment.
	 * @param attrs A collection of attributes.
	 */
	public NumberPicker(Context context, AttributeSet attrs) {
		this(context, attrs, R.attr.numberPickerStyle);
	}

	/**
	 * Create a new number picker
	 *
	 * @param context the application environment.
	 * @param attrs a collection of attributes.
	 * @param defStyle The default style to apply to this view.
	 */
	public NumberPicker(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs);

		// process style attributes
		TypedArray attributesArray = context.obtainStyledAttributes(
				attrs, R.styleable.NumberPicker, defStyle, 0);
		final int layoutResId = attributesArray.getResourceId(
				R.styleable.NumberPicker_internalLayout, DEFAULT_LAYOUT_RESOURCE_ID);

		mHasSelectorWheel = (layoutResId != DEFAULT_LAYOUT_RESOURCE_ID);

		mSolidColor = attributesArray.getColor(R.styleable.NumberPicker_solidColor, 0);

		mSelectionDivider = attributesArray.getDrawable(R.styleable.NumberPicker_selectionDivider);

		final int defSelectionDividerHeight = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_DIP, UNSCALED_DEFAULT_SELECTION_DIVIDER_HEIGHT,
				getResources().getDisplayMetrics());
		mSelectionDividerHeight = attributesArray.getDimensionPixelSize(
				R.styleable.NumberPicker_selectionDividerHeight, defSelectionDividerHeight);

		final int defSelectionDividerDistance = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_DIP, UNSCALED_DEFAULT_SELECTION_DIVIDERS_DISTANCE,
				getResources().getDisplayMetrics());
		mSelectionDividersDistance = attributesArray.getDimensionPixelSize(
				R.styleable.NumberPicker_selectionDividersDistance, defSelectionDividerDistance);

		mMinHeight = attributesArray.getDimensionPixelSize(
				R.styleable.NumberPicker_internalMinHeight, SIZE_UNSPECIFIED);

		mMaxHeight = attributesArray.getDimensionPixelSize(
				R.styleable.NumberPicker_internalMaxHeight, SIZE_UNSPECIFIED);
		if ((mMinHeight != SIZE_UNSPECIFIED) && (mMaxHeight != SIZE_UNSPECIFIED)
				&& (mMinHeight > mMaxHeight)) {
			throw new IllegalArgumentException("minHeight > maxHeight");
		}

		mMinWidth = attributesArray.getDimensionPixelSize(
				R.styleable.NumberPicker_internalMinWidth, SIZE_UNSPECIFIED);

		mMaxWidth = attributesArray.getDimensionPixelSize(
				R.styleable.NumberPicker_internalMaxWidth, SIZE_UNSPECIFIED);
		if ((mMinWidth != SIZE_UNSPECIFIED) && (mMaxWidth != SIZE_UNSPECIFIED)
				&& (mMinWidth > mMaxWidth)) {
			throw new IllegalArgumentException("minWidth > maxWidth");
		}

		mComputeMaxWidth = (mMaxWidth == SIZE_UNSPECIFIED);

		mVirtualButtonPressedDrawable = attributesArray.getDrawable(
				R.styleable.NumberPicker_virtualButtonPressedDrawable);

		attributesArray.recycle();

		mPressedStateHelper = new PressedStateHelper();

		// By default Linearlayout that we extend is not drawn. This is
		// its draw() method is not called but dispatchDraw() is called
		// directly (see ViewGroup.drawChild()). However, this class uses
		// the fading edge effect implemented by View and we need our
		// draw() method to be called. Therefore, we declare we will draw.
		setWillNotDraw(!mHasSelectorWheel);

		LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(
				Context.LAYOUT_INFLATER_SERVICE);
		inflater.inflate(layoutResId, this, true);

		OnClickListener onClickListener = new OnClickListener() {
			@Override
			public void onClick(View v) {
				hideSoftInput();
				mInputText.clearFocus();
				if (v.getId() == R.id.np__increment) {
					changeValueByOne(true);
				} else {
					changeValueByOne(false);
				}
			}
		};

		OnLongClickListener onLongClickListener = new OnLongClickListener() {
			@Override
			public boolean onLongClick(View v) {
				hideSoftInput();
				mInputText.clearFocus();
				if (v.getId() == R.id.np__increment) {
					postChangeCurrentByOneFromLongPress(true, 0);
				} else {
					postChangeCurrentByOneFromLongPress(false, 0);
				}
				return true;
			}
		};

		// increment button
		if (!mHasSelectorWheel) {
			mIncrementButton = (ImageButton) findViewById(R.id.np__increment);
			mIncrementButton.setOnClickListener(onClickListener);
			mIncrementButton.setOnLongClickListener(onLongClickListener);
		} else {
			mIncrementButton = null;
		}

		// decrement button
		if (!mHasSelectorWheel) {
			mDecrementButton = (ImageButton) findViewById(R.id.np__decrement);
			mDecrementButton.setOnClickListener(onClickListener);
			mDecrementButton.setOnLongClickListener(onLongClickListener);
		} else {
			mDecrementButton = null;
		}

		// input text
		mInputText = (EditText) findViewById(R.id.np__numberpicker_input);
		mInputText.setOnFocusChangeListener(new OnFocusChangeListener() {
			@Override
			public void onFocusChange(View v, boolean hasFocus) {
				if (hasFocus) {
					mInputText.selectAll();
				} else {
					mInputText.setSelection(0, 0);
					validateInputTextView(v);
				}
			}
		});
		mInputText.setFilters(new InputFilter[] {
				new InputTextFilter()
		});

		mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER);
		mInputText.setImeOptions(EditorInfo.IME_ACTION_DONE);

		// @XIYILI
		mValueIndicator = (TextView)findViewById(R.id.xiyili_numberpicker_indicator);
		final float density  = getResources().getDisplayMetrics().density;
		mFirstSelectorTopOffset = (int) ((density*4)+0.5f);

		// initialize constants
		ViewConfiguration configuration = ViewConfiguration.get(context);
		mTouchSlop = configuration.getScaledTouchSlop();
		mMinimumFlingVelocity = configuration.getScaledMinimumFlingVelocity();
		mMaximumFlingVelocity = configuration.getScaledMaximumFlingVelocity()
				/ SELECTOR_MAX_FLING_VELOCITY_ADJUSTMENT;
		mTextSize = (int) mInputText.getTextSize();

		// create the selector wheel paint
		Paint paint = new Paint();
		paint.setAntiAlias(true);
		paint.setTextAlign(Align.CENTER);
		paint.setTextSize((mTextSize*0.66f));
		paint.setTypeface(mInputText.getTypeface());
		ColorStateList colors = mInputText.getTextColors();
		//	int color = colors.getColorForState(ENABLED_STATE_SET, Color.WHITE);
		int color = Color.LTGRAY;
		paint.setColor(color);
		mSelectorWheelPaint = paint;

		// @XIYILI
		mMiddleSelectorWheelPaint = new Paint(mInputText.getPaint());
		mMiddleSelectorWheelPaint.setAntiAlias(true);
		mMiddleSelectorWheelPaint.setTextAlign(Align.CENTER);
		int textColor = colors.getColorForState(ENABLED_STATE_SET, Color.WHITE);
		mMiddleSelectorWheelPaint.setColor(textColor);


		// create the fling and adjust scrollers
		mFlingScroller = new Scroller(getContext(), null, true);
		mAdjustScroller = new Scroller(getContext(), new DecelerateInterpolator(2.5f));

		updateInputTextView();

		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
			// If not explicitly specified this view is important for accessibility.
			if (getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
				setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
			}
		}
	}

	@Override
	protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
		if (!mHasSelectorWheel) {
			super.onLayout(changed, left, top, right, bottom);
			return;
		}
		final int msrdWdth = getMeasuredWidth();
		final int msrdHght = getMeasuredHeight();

		// Input text centered horizontally.
		final int inptTxtMsrdWdth = mInputText.getMeasuredWidth();
		final int inptTxtMsrdHght = mInputText.getMeasuredHeight();
		final int inptTxtLeft = (msrdWdth - inptTxtMsrdWdth) / 2;
		final int inptTxtTop = (msrdHght - inptTxtMsrdHght) / 2;
		final int inptTxtRight = inptTxtLeft + inptTxtMsrdWdth;
		final int inptTxtBottom = inptTxtTop + inptTxtMsrdHght;
		mInputText.layout(inptTxtLeft, inptTxtTop, inptTxtRight, inptTxtBottom);

		//@XIYILI  indicator in to the right and top of the input text
		final int indicatorMeasuredWidth = mValueIndicator.getMeasuredWidth();
		final int indicatorMeasuredHeight = mValueIndicator.getMeasuredHeight();
		final int indicatorLeft = inptTxtRight;
		final int indicatorRight = indicatorLeft + indicatorMeasuredWidth;
		final int indicatorTop = inptTxtTop;// - (indicatorMeasuredHeight/2);
		final int indicatorBottom = indicatorTop+indicatorMeasuredHeight;
		mValueIndicator.layout(indicatorLeft,indicatorTop, indicatorRight,  indicatorBottom);

		if (changed) {
			// need to do all this when we know our size
			initializeSelectorWheel();
			initializeFadingEdges();
			mTopSelectionDividerTop = ((getHeight() - mSelectionDividersDistance) / 2)
					- mSelectionDividerHeight;
			mBottomSelectionDividerBottom = mTopSelectionDividerTop + (2 * mSelectionDividerHeight)
					+ mSelectionDividersDistance;
		}
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		if (!mHasSelectorWheel) {
			super.onMeasure(widthMeasureSpec, heightMeasureSpec);
			return;
		}
		// Try greedily to fit the max width and height.
		final int newWidthMeasureSpec = makeMeasureSpec(widthMeasureSpec, mMaxWidth);
		final int newHeightMeasureSpec = makeMeasureSpec(heightMeasureSpec, mMaxHeight);
		super.onMeasure(newWidthMeasureSpec, newHeightMeasureSpec);
		// Flag if we are measured with width or height less than the respective min.
		final int widthSize = resolveSizeAndStateRespectingMinSize(mMinWidth, getMeasuredWidth(),
				widthMeasureSpec);
		final int heightSize = resolveSizeAndStateRespectingMinSize(mMinHeight, getMeasuredHeight(),
				heightMeasureSpec);
		setMeasuredDimension(widthSize, heightSize);
	}

	/**
	 * 移动到scroller的最终位置，
	 * 确定Scroller移动到最后的位置，并且快速滚动使得数值滚轮在恰当的位置。
	 * Move to the final position of a scroller. Ensures to force finish the scroller
	 * and if it is not at its final position a scroll of the selector wheel is
	 * performed to fast forward to the final position.
	 *
	 * @param scroller The scroller to whose final position to get.
	 * @return True of the a move was performed, i.e. the scroller was not in final position.
	 */
	private boolean moveToFinalScrollerPosition(Scroller scroller) {
		scroller.forceFinished(true);
		int amountToScroll = scroller.getFinalY() - scroller.getCurrY();
		int futureScrollOffset = (mCurrentScrollOffset + amountToScroll) % mSelectorElementHeight;
		int overshootAdjustment = mInitialScrollOffset - futureScrollOffset;
		if (overshootAdjustment != 0) {
			if (Math.abs(overshootAdjustment) > (mSelectorElementHeight / 2)) {
				if (overshootAdjustment > 0) {
					overshootAdjustment -= mSelectorElementHeight;
				} else {
					overshootAdjustment += mSelectorElementHeight;
				}
			}
			amountToScroll += overshootAdjustment;
			scrollBy(0, amountToScroll);
			return true;
		}
		return false;
	}

	@Override
	public boolean onInterceptTouchEvent(MotionEvent event) {
		if (!mHasSelectorWheel || !isEnabled()) {
			return false;
		}
		final int action = event.getAction() & MotionEvent.ACTION_MASK;
		switch (action) {
		case MotionEvent.ACTION_DOWN: {
			removeAllCallbacks();
			mInputText.setVisibility(View.INVISIBLE);
			mLastDownOrMoveEventY = mLastDownEventY = event.getY();
			mLastDownEventTime = event.getEventTime();
			mIngonreMoveEvents = false;
			mShowSoftInputOnTap = false;
			// Handle pressed state before any state change.
			if (mLastDownEventY < mTopSelectionDividerTop) {
				if (mScrollState == OnScrollListener.SCROLL_STATE_IDLE) {
					mPressedStateHelper.buttonPressDelayed(
							PressedStateHelper.BUTTON_DECREMENT);
				}
			} else if (mLastDownEventY > mBottomSelectionDividerBottom) {
				if (mScrollState == OnScrollListener.SCROLL_STATE_IDLE) {
					mPressedStateHelper.buttonPressDelayed(
							PressedStateHelper.BUTTON_INCREMENT);
				}
			}
			// Make sure we support flinging inside scrollables.
			getParent().requestDisallowInterceptTouchEvent(true);
			if (!mFlingScroller.isFinished()) {
				mFlingScroller.forceFinished(true);
				mAdjustScroller.forceFinished(true);
				onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
			} else if (!mAdjustScroller.isFinished()) {
				mFlingScroller.forceFinished(true);
				mAdjustScroller.forceFinished(true);
			} else if (mLastDownEventY < mTopSelectionDividerTop) {
				hideSoftInput();
				postChangeCurrentByOneFromLongPress(
						false, ViewConfiguration.getLongPressTimeout());
			} else if (mLastDownEventY > mBottomSelectionDividerBottom) {
				hideSoftInput();
				postChangeCurrentByOneFromLongPress(
						true, ViewConfiguration.getLongPressTimeout());
			} else {
				mShowSoftInputOnTap = true;
				postBeginSoftInputOnLongPressCommand();
			}
			return true;
		}
		}
		return false;
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		if (!isEnabled() || !mHasSelectorWheel) {
			return false;
		}
		if (mVelocityTracker == null) {
			mVelocityTracker = VelocityTracker.obtain();
		}
		mVelocityTracker.addMovement(event);
		int action = event.getAction() & MotionEvent.ACTION_MASK;
		switch (action) {
		case MotionEvent.ACTION_MOVE: {
			if (mIngonreMoveEvents) {
				break;
			}
			float currentMoveY = event.getY();
			if (mScrollState != OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
				int deltaDownY = (int) Math.abs(currentMoveY - mLastDownEventY);
				if (deltaDownY > mTouchSlop) {
					removeAllCallbacks();
					onScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
				}
			} else {
				int deltaMoveY = (int) ((currentMoveY - mLastDownOrMoveEventY));
				scrollBy(0, deltaMoveY);
				invalidate();
			}
			mLastDownOrMoveEventY = currentMoveY;
		} break;
		case MotionEvent.ACTION_UP: {
			removeBeginSoftInputCommand();
			removeChangeCurrentByOneFromLongPress();
			mPressedStateHelper.cancel();
			VelocityTracker velocityTracker = mVelocityTracker;
			velocityTracker.computeCurrentVelocity(1000, mMaximumFlingVelocity);
			int initialVelocity = (int) velocityTracker.getYVelocity();
			if (Math.abs(initialVelocity) > mMinimumFlingVelocity) {
				fling(initialVelocity);
				onScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
			} else {
				int eventY = (int) event.getY();
				int deltaMoveY = (int) Math.abs(eventY - mLastDownEventY);
				long deltaTime = event.getEventTime() - mLastDownEventTime;
				long tapTimeout = ViewConfiguration.getTapTimeout();
				if (deltaMoveY <= mTouchSlop) { // && deltaTime < ViewConfiguration.getTapTimeout()) {
					if (mShowSoftInputOnTap) {
						mShowSoftInputOnTap = false;
						showSoftInput();
					} else {
						int selectorIndexOffset = (eventY / mSelectorElementHeight)
								- SELECTOR_MIDDLE_ITEM_INDEX;
						if (selectorIndexOffset > 0) {
							changeValueByOne(true);
							mPressedStateHelper.buttonTapped(
									PressedStateHelper.BUTTON_INCREMENT);
						} else if (selectorIndexOffset < 0) {
							changeValueByOne(false);
							mPressedStateHelper.buttonTapped(
									PressedStateHelper.BUTTON_DECREMENT);
						}
					}
				} else {
					ensureScrollWheelAdjusted();
				}
				onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
			}
			mVelocityTracker.recycle();
			mVelocityTracker = null;
		} break;
		}
		return true;
	}


	@Override
	public boolean dispatchTouchEvent(MotionEvent event) {
		// 当用户停止操作时，清除所有的回调。
		final int action = event.getAction() & MotionEvent.ACTION_MASK;
		switch (action) {
		case MotionEvent.ACTION_CANCEL:
		case MotionEvent.ACTION_UP:
			removeAllCallbacks();
			break;
		}
		return super.dispatchTouchEvent(event);
	}

	@Override
	public boolean dispatchKeyEvent(KeyEvent event) {
		final int keyCode = event.getKeyCode();
		switch (keyCode) {
		case KeyEvent.KEYCODE_DPAD_CENTER:
		case KeyEvent.KEYCODE_ENTER:
			removeAllCallbacks();
			break;
		case KeyEvent.KEYCODE_DPAD_DOWN:
		case KeyEvent.KEYCODE_DPAD_UP:
			if (!mHasSelectorWheel) {
				break;
			}
			switch (event.getAction()) {
			case KeyEvent.ACTION_DOWN:
				if (mWrapSelectorWheel || (keyCode == KeyEvent.KEYCODE_DPAD_DOWN)
						? getValue() < getMaxValue() : getValue() > getMinValue()) {
					requestFocus();
					mLastHandledDownDpadKeyCode = keyCode;
					removeAllCallbacks();
					if (mFlingScroller.isFinished()) {
						changeValueByOne(keyCode == KeyEvent.KEYCODE_DPAD_DOWN);
					}
					return true;
				}
				break;
			case KeyEvent.ACTION_UP:
				if (mLastHandledDownDpadKeyCode == keyCode) {
					mLastHandledDownDpadKeyCode = -1;
					return true;
				}
				break;
			}
		}
		return super.dispatchKeyEvent(event);
	}

	@Override
	public boolean dispatchTrackballEvent(MotionEvent event) {
		final int action = event.getAction() & MotionEvent.ACTION_MASK;
		switch (action) {
		case MotionEvent.ACTION_CANCEL:
		case MotionEvent.ACTION_UP:
			removeAllCallbacks();
			break;
		}
		return super.dispatchTrackballEvent(event);
	}

	@Override
	protected boolean dispatchHoverEvent(MotionEvent event) {
		if (!mHasSelectorWheel) {
			return super.dispatchHoverEvent(event);
		}

		if (((AccessibilityManager) getContext().getSystemService(Context.ACCESSIBILITY_SERVICE)).isEnabled()) {
			final int eventY = (int) event.getY();
			final int hoveredVirtualViewId;
			if (eventY < mTopSelectionDividerTop) {
				hoveredVirtualViewId = AccessibilityNodeProviderImpl.VIRTUAL_VIEW_ID_DECREMENT;
			} else if (eventY > mBottomSelectionDividerBottom) {
				hoveredVirtualViewId = AccessibilityNodeProviderImpl.VIRTUAL_VIEW_ID_INCREMENT;
			} else {
				hoveredVirtualViewId = AccessibilityNodeProviderImpl.VIRTUAL_VIEW_ID_INPUT;
			}
			final int action = event.getAction() & MotionEvent.ACTION_MASK;
			SupportAccessibilityNodeProvider provider = getSupportAccessibilityNodeProvider();

			switch (action) {
			case MotionEvent.ACTION_HOVER_ENTER: {
				provider.sendAccessibilityEventForVirtualView(hoveredVirtualViewId,
						AccessibilityEvent.TYPE_VIEW_HOVER_ENTER);
				mLastHoveredChildVirtualViewId = hoveredVirtualViewId;
				provider.performAction(hoveredVirtualViewId,
						AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
			} break;
			case MotionEvent.ACTION_HOVER_MOVE: {
				if ((mLastHoveredChildVirtualViewId != hoveredVirtualViewId)
						&& (mLastHoveredChildVirtualViewId != View.NO_ID)) {
					provider.sendAccessibilityEventForVirtualView(
							mLastHoveredChildVirtualViewId,
							AccessibilityEvent.TYPE_VIEW_HOVER_EXIT);
					provider.sendAccessibilityEventForVirtualView(hoveredVirtualViewId,
							AccessibilityEvent.TYPE_VIEW_HOVER_ENTER);
					mLastHoveredChildVirtualViewId = hoveredVirtualViewId;
					provider.performAction(hoveredVirtualViewId,
							AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
				}
			} break;
			case MotionEvent.ACTION_HOVER_EXIT: {
				provider.sendAccessibilityEventForVirtualView(hoveredVirtualViewId,
						AccessibilityEvent.TYPE_VIEW_HOVER_EXIT);
				mLastHoveredChildVirtualViewId = View.NO_ID;
			} break;
			}
		}
		return false;
	}

	@Override
	public void computeScroll() {
		Scroller scroller = mFlingScroller;
		if (scroller.isFinished()) {
			scroller = mAdjustScroller;
			if (scroller.isFinished()) {
				return;
			}
		}
		scroller.computeScrollOffset();
		int currentScrollerY = scroller.getCurrY();
		if (mPreviousScrollerY == 0) {
			mPreviousScrollerY = scroller.getStartY();
		}
		scrollBy(0, currentScrollerY - mPreviousScrollerY);
		mPreviousScrollerY = currentScrollerY;
		if (scroller.isFinished()) {
			onScrollerFinished(scroller);
		} else {
			invalidate();
		}
	}

	@Override
	public void setEnabled(boolean enabled) {
		super.setEnabled(enabled);
		if (!mHasSelectorWheel) {
			mIncrementButton.setEnabled(enabled);
		}
		if (!mHasSelectorWheel) {
			mDecrementButton.setEnabled(enabled);
		}
		mInputText.setEnabled(enabled);
	}

	@Override
	public void scrollBy(int x, int y) {
		int[] selectorIndices = mSelectorIndices;
		if (!mWrapSelectorWheel && (y > 0)
				&& (selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue)) {
			mCurrentScrollOffset = mInitialScrollOffset;
			return;
		}
		if (!mWrapSelectorWheel && (y < 0)
				&& (selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue)) {
			mCurrentScrollOffset = mInitialScrollOffset;
			return;
		}
		mCurrentScrollOffset += y;
		while ((mCurrentScrollOffset - mInitialScrollOffset) > mSelectorTextGapHeight) {
			mCurrentScrollOffset -= mSelectorElementHeight;
			decrementSelectorIndices(selectorIndices);
			setValueInternal(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX], true);
			if (!mWrapSelectorWheel && (selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue)) {
				mCurrentScrollOffset = mInitialScrollOffset;
			}
		}
		while ((mCurrentScrollOffset - mInitialScrollOffset) < -mSelectorTextGapHeight) {
			mCurrentScrollOffset += mSelectorElementHeight;
			incrementSelectorIndices(selectorIndices);
			setValueInternal(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX], true);
			if (!mWrapSelectorWheel && (selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue)) {
				mCurrentScrollOffset = mInitialScrollOffset;
			}
		}
	}

	@Override
	public int getSolidColor() {
		return mSolidColor;
	}

	/**
	 * Sets the listener to be notified on change of the current value.
	 *
	 * @param onValueChangedListener The listener.
	 */
	public void setOnValueChangedListener(OnValueChangeListener onValueChangedListener) {
		mOnValueChangeListener = onValueChangedListener;
	}

	/**
	 * Set listener to be notified for scroll state changes.
	 *
	 * @param onScrollListener The listener.
	 */
	public void setOnScrollListener(OnScrollListener onScrollListener) {
		mOnScrollListener = onScrollListener;
	}

	/**
	 * Set the formatter to be used for formatting the current value.
	 * <p>
	 * Note: If you have provided alternative values for the values this
	 * formatter is never invoked.
	 * </p>
	 *
	 * @param formatter The formatter object. If formatter is <code>null</code>,
	 *            {@link String#valueOf(int)} will be used.
	 *@see #setDisplayedValues(String[])
	 */
	public void setFormatter(Formatter formatter) {
		if (formatter == mFormatter) {
			return;
		}
		mFormatter = formatter;
		initializeSelectorWheelIndices();
		updateInputTextView();
	}

	/**
	 * Set the current value for the number picker.
	 * <p>
	 * If the argument is less than the {@link NumberPicker#getMinValue()} and
	 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the
	 * current value is set to the {@link NumberPicker#getMinValue()} value.
	 * </p>
	 * <p>
	 * If the argument is less than the {@link NumberPicker#getMinValue()} and
	 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the
	 * current value is set to the {@link NumberPicker#getMaxValue()} value.
	 * </p>
	 * <p>
	 * If the argument is less than the {@link NumberPicker#getMaxValue()} and
	 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the
	 * current value is set to the {@link NumberPicker#getMaxValue()} value.
	 * </p>
	 * <p>
	 * If the argument is less than the {@link NumberPicker#getMaxValue()} and
	 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the
	 * current value is set to the {@link NumberPicker#getMinValue()} value.
	 * </p>
	 *
	 * @param value The current value.
	 * @see #setWrapSelectorWheel(boolean)
	 * @see #setMinValue(int)
	 * @see #setMaxValue(int)
	 */
	public void setValue(int value) {
		setValueInternal(value, false);
	}

	/**
	 * Shows the soft input for its input text.
	 */
	private void showSoftInput() {
		InputMethodManager inputMethodManager = (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
		if (inputMethodManager != null) {
			if (mHasSelectorWheel) {
				mInputText.setVisibility(View.VISIBLE);
			}
			mInputText.requestFocus();
			inputMethodManager.showSoftInput(mInputText, 0);
		}
	}

	/**
	 * Hides the soft input if it is active for the input text.
	 */
	private void hideSoftInput() {
		InputMethodManager inputMethodManager = (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
		if ((inputMethodManager != null) && inputMethodManager.isActive(mInputText)) {
			inputMethodManager.hideSoftInputFromWindow(getWindowToken(), 0);
			if (mHasSelectorWheel) {
				mInputText.setVisibility(View.INVISIBLE);
			}
		}
	}

	/**
	 * Computes the max width if no such specified as an attribute.
	 */
	private void tryComputeMaxWidth() {
		if (!mComputeMaxWidth) {
			return;
		}
		int maxTextWidth = 0;
		if (mDisplayedValues == null) {
			float maxDigitWidth = 0;
			for (int i = 0; i <= 9; i++) {
				final float digitWidth = mSelectorWheelPaint.measureText(formatNumberWithLocale(i));
				if (digitWidth > maxDigitWidth) {
					maxDigitWidth = digitWidth;
				}
			}
			int numberOfDigits = 0;
			int current = mMaxValue;
			while (current > 0) {
				numberOfDigits++;
				current = current / 10;
			}
			maxTextWidth = (int) (numberOfDigits * maxDigitWidth);
		} else {
			final int valueCount = mDisplayedValues.length;
			for (int i = 0; i < valueCount; i++) {
				final float textWidth = mSelectorWheelPaint.measureText(mDisplayedValues[i]);
				if (textWidth > maxTextWidth) {
					maxTextWidth = (int) textWidth;
				}
			}
		}
		maxTextWidth += mInputText.getPaddingLeft() + mInputText.getPaddingRight();
		if (mMaxWidth != maxTextWidth) {
			if (maxTextWidth > mMinWidth) {
				mMaxWidth = maxTextWidth;
			} else {
				mMaxWidth = mMinWidth;
			}
			invalidate();
		}
	}

	/**
	 * Gets whether the selector wheel wraps when reaching the min/max value.
	 *
	 * @return True if the selector wheel wraps.
	 *
	 * @see #getMinValue()
	 * @see #getMaxValue()
	 */
	public boolean getWrapSelectorWheel() {
		return mWrapSelectorWheel;
	}

	/**
	 * Sets whether the selector wheel shown during flinging/scrolling should
	 * wrap around the {@link NumberPicker#getMinValue()} and
	 * {@link NumberPicker#getMaxValue()} values.
	 * <p>
	 * By default if the range (max - min) is more than the number of items shown
	 * on the selector wheel the selector wheel wrapping is enabled.
	 * </p>
	 * <p>
	 * <strong>Note:</strong> If the number of items, i.e. the range (
	 * {@link #getMaxValue()} - {@link #getMinValue()}) is less than
	 * the number of items shown on the selector wheel, the selector wheel will
	 * not wrap. Hence, in such a case calling this method is a NOP.
	 * </p>
	 *
	 * @param wrapSelectorWheel Whether to wrap.
	 */
	public void setWrapSelectorWheel(boolean wrapSelectorWheel) {
		final boolean wrappingAllowed = (mMaxValue - mMinValue) >= mSelectorIndices.length;
		if ((!wrapSelectorWheel || wrappingAllowed) && (wrapSelectorWheel != mWrapSelectorWheel)) {
			mWrapSelectorWheel = wrapSelectorWheel;
		}
	}

	/**
	 * Sets the speed at which the numbers be incremented and decremented when
	 * the up and down buttons are long pressed respectively.
	 * <p>
	 * The default value is 300 ms.
	 * </p>
	 *
	 * @param intervalMillis The speed (in milliseconds) at which the numbers
	 *            will be incremented and decremented.
	 */
	public void setOnLongPressUpdateInterval(long intervalMillis) {
		mLongPressUpdateInterval = intervalMillis;
	}

	/**
	 * Returns the value of the picker.
	 *
	 * @return The value.
	 */
	public int getValue() {
		return mValue;
	}

	/**
	 * Returns the min value of the picker.
	 *
	 * @return The min value
	 */
	public int getMinValue() {
		return mMinValue;
	}

	/**
	 * Sets the min value of the picker.
	 *
	 * @param minValue The min value inclusive.
	 *
	 * <strong>Note:</strong> The length of the displayed values array
	 * set via {@link #setDisplayedValues(String[])} must be equal to the
	 * range of selectable numbers which is equal to
	 * {@link #getMaxValue()} - {@link #getMinValue()} + 1.
	 */
	public void setMinValue(int minValue) {
		if (mMinValue == minValue) {
			return;
		}
		if (minValue < 0) {
			throw new IllegalArgumentException("minValue must be >= 0");
		}
		mMinValue = minValue;
		if (mMinValue > mValue) {
			mValue = mMinValue;
		}
		boolean wrapSelectorWheel = (mMaxValue - mMinValue) > mSelectorIndices.length;
		setWrapSelectorWheel(wrapSelectorWheel);
		initializeSelectorWheelIndices();
		updateInputTextView();
		tryComputeMaxWidth();
		invalidate();
	}

	/**
	 * Returns the max value of the picker.
	 *
	 * @return The max value.
	 */
	public int getMaxValue() {
		return mMaxValue;
	}

	/**
	 * Sets the max value of the picker.
	 *
	 * @param maxValue The max value inclusive.
	 *
	 * <strong>Note:</strong> The length of the displayed values array
	 * set via {@link #setDisplayedValues(String[])} must be equal to the
	 * range of selectable numbers which is equal to
	 * {@link #getMaxValue()} - {@link #getMinValue()} + 1.
	 */
	public void setMaxValue(int maxValue) {
		if (mMaxValue == maxValue) {
			return;
		}
		if (maxValue < 0) {
			throw new IllegalArgumentException("maxValue must be >= 0");
		}
		mMaxValue = maxValue;
		if (mMaxValue < mValue) {
			mValue = mMaxValue;
		}
		boolean wrapSelectorWheel = (mMaxValue - mMinValue) > mSelectorIndices.length;
		setWrapSelectorWheel(wrapSelectorWheel);
		initializeSelectorWheelIndices();
		updateInputTextView();
		tryComputeMaxWidth();
		invalidate();
	}

	/**
	 * Gets the values to be displayed instead of string values.
	 *
	 * @return The displayed values.
	 */
	public String[] getDisplayedValues() {
		return mDisplayedValues;
	}

	/**
	 * Sets the values to be displayed.
	 *
	 * @param displayedValues The displayed values.
	 *
	 * <strong>Note:</strong> The length of the displayed values array
	 * must be equal to the range of selectable numbers which is equal to
	 * {@link #getMaxValue()} - {@link #getMinValue()} + 1.
	 */
	public void setDisplayedValues(String[] displayedValues) {
		if (mDisplayedValues == displayedValues) {
			return;
		}
		mDisplayedValues = displayedValues;
		if (mDisplayedValues != null) {
			// Allow text entry rather than strictly numeric entry.
			mInputText.setRawInputType(InputType.TYPE_CLASS_TEXT
					| InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
		} else {
			mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER);
		}
		updateInputTextView();
		initializeSelectorWheelIndices();
		tryComputeMaxWidth();
	}

	@Override
	protected float getTopFadingEdgeStrength() {
		return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH;
	}

	@Override
	protected float getBottomFadingEdgeStrength() {
		return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH;
	}

	@Override
	protected void onDetachedFromWindow() {
		removeAllCallbacks();
	}

	@Override
	protected void onDraw(Canvas canvas) {
		if (!mHasSelectorWheel) {
			super.onDraw(canvas);
			return;
		}
		float x = (getRight() - getLeft()) / 2;
		float y = mCurrentScrollOffset;

		// draw the virtual buttons pressed state if needed
		if ((mVirtualButtonPressedDrawable != null)
				&& (mScrollState == OnScrollListener.SCROLL_STATE_IDLE)) {
			if (mDecrementVirtualButtonPressed) {
				//mVirtualButtonPressedDrawable.setState(PRESSED_STATE_SET);
				mVirtualButtonPressedDrawable.setState(PRESSED_ENABLED_STATE_SET);
				mVirtualButtonPressedDrawable.setBounds(0, 0, getRight(), mTopSelectionDividerTop);
				mVirtualButtonPressedDrawable.draw(canvas);
			}
			if (mIncrementVirtualButtonPressed) {
				//mVirtualButtonPressedDrawable.setState(PRESSED_STATE_SET);
				mVirtualButtonPressedDrawable.setState(PRESSED_ENABLED_STATE_SET);
				mVirtualButtonPressedDrawable.setBounds(0, mBottomSelectionDividerBottom, getRight(),
						getBottom());
				mVirtualButtonPressedDrawable.draw(canvas);
			}
		}

		// draw the selector wheel
		int[] selectorIndices = mSelectorIndices;
		for (int i = 0; i < selectorIndices.length; i++) {
			int selectorIndex = selectorIndices[i];
			String scrollSelectorValue = mSelectorIndexToStringCache.get(selectorIndex);
			// Do not draw the middle item if input is visible since the input
			// is shown only if the wheel is static and it covers the middle
			// item. Otherwise, if the user starts editing the text via the
			// IME he may see a dimmed version of the old value intermixed
			// with the new one.
			if ((i != SELECTOR_MIDDLE_ITEM_INDEX) || (mInputText.getVisibility() != VISIBLE)) {
				if(i == SELECTOR_MIDDLE_ITEM_INDEX) {// @XIYILI
					canvas.drawText(scrollSelectorValue, x, y, mMiddleSelectorWheelPaint);
				}else {
					//@XIYILI
					if(i == 0) {
						canvas.drawText(scrollSelectorValue, x, y-mFirstSelectorTopOffset, mSelectorWheelPaint);
					}else {
						canvas.drawText(scrollSelectorValue, x, y, mSelectorWheelPaint);
					}
				}
			}
			y += mSelectorElementHeight;
		}

		// @XIYILI
		//		// draw the selection dividers
		//		if (mSelectionDivider != null) {
		//			// draw the top divider
		//			int topOfTopDivider = mTopSelectionDividerTop;
		//			int bottomOfTopDivider = topOfTopDivider + mSelectionDividerHeight;
		//			mSelectionDivider.setBounds(0, topOfTopDivider, getRight(), bottomOfTopDivider);
		//			mSelectionDivider.draw(canvas);
		//
		//			// draw the bottom divider
		//			int bottomOfBottomDivider = mBottomSelectionDividerBottom;
		//			int topOfBottomDivider = bottomOfBottomDivider - mSelectionDividerHeight;
		//			mSelectionDivider.setBounds(0, topOfBottomDivider, getRight(), bottomOfBottomDivider);
		//			mSelectionDivider.draw(canvas);
		//		}
	}

	@Override
	public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
		super.onInitializeAccessibilityEvent(event);
		event.setClassName(NumberPicker.class.getName());
		event.setScrollable(true);
		event.setScrollY((mMinValue + mValue) * mSelectorElementHeight);
		event.setMaxScrollY((mMaxValue - mMinValue) * mSelectorElementHeight);
	}

	@Override
	public AccessibilityNodeProvider getAccessibilityNodeProvider() {
		if (!mHasSelectorWheel) {
			return super.getAccessibilityNodeProvider();
		}
		if (mAccessibilityNodeProvider == null) {
			mAccessibilityNodeProvider = new SupportAccessibilityNodeProvider();
		}
		return mAccessibilityNodeProvider.mProvider;
	}

	/**
	 * 生成一个尽可能多的使用最大值的 MeasureSpec
	 * Makes a measure spec that tries greedily to use the max value.
	 *
	 * @param measureSpec The measure spec.
	 * @param maxSize The max value for the size.
	 * @return A measure spec greedily imposing the max size.
	 */
	private int makeMeasureSpec(int measureSpec, int maxSize) {
		if (maxSize == SIZE_UNSPECIFIED) {
			return measureSpec;
		}
		final int size = MeasureSpec.getSize(measureSpec);
		final int mode = MeasureSpec.getMode(measureSpec);
		switch (mode) {
		case MeasureSpec.EXACTLY:
			return measureSpec;
		case MeasureSpec.AT_MOST:
			return MeasureSpec.makeMeasureSpec(Math.min(size, maxSize), MeasureSpec.EXACTLY);
		case MeasureSpec.UNSPECIFIED:
			return MeasureSpec.makeMeasureSpec(maxSize, MeasureSpec.EXACTLY);
		default:
			throw new IllegalArgumentException("Unknown measure mode: " + mode);
		}
	}

	/**
	 * 调整大小及状态并尝试保证最小值的实用方法
	 * 
	 * Utility to reconcile a desired size and state, with constraints imposed
	 * by a MeasureSpec. Tries to respect the min size, unless a different size
	 * is imposed by the constraints.
	 *
	 * @param minSize The minimal desired size.
	 * @param measuredSize The currently measured size.
	 * @param measureSpec The current measure spec.
	 * @return The resolved size and state.
	 */
	private int resolveSizeAndStateRespectingMinSize(
			int minSize, int measuredSize, int measureSpec) {
		if (minSize != SIZE_UNSPECIFIED) {
			final int desiredWidth = Math.max(minSize, measuredSize);
			return resolveSizeAndState(desiredWidth, measureSpec, 0);
		} else {
			return measuredSize;
		}
	}

	/**
	 * 根据一个MeasureSpec指定的限制，调整所需要的尺寸和状态在实用类。
	 * 返回的是一个 组合值，在 {@link #MEASURED_SIZE_MASK}位包含了大小值。
	 * 在{@link #MEASURED_STATE_TOO_SMALL}包含了可选的结果状态值（如果结果比想要的尺寸小的话）。
	 * 
	 * Utility to reconcile a desired size and state, with constraints imposed
	 * by a MeasureSpec.  Will take the desired size, unless a different size
	 * is imposed by the constraints.  The returned value is a compound integer,
	 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and
	 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting
	 * size is smaller than the size the view wants to be.
	 *
	 * @param size View需要多大的尺寸 How big the view wants to be
	 * @param measureSpec 父View给出的限制 Constraints imposed by the parent
	 * @return Size information bit mask as defined by
	 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}.
	 */
	public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) {
		int result = size;
		int specMode = MeasureSpec.getMode(measureSpec);
		int specSize =  MeasureSpec.getSize(measureSpec);
		switch (specMode) {
		case MeasureSpec.UNSPECIFIED:
			result = size;
			break;
		case MeasureSpec.AT_MOST:
			if (specSize < size) {
				result = specSize | MEASURED_STATE_TOO_SMALL;
			} else {
				result = size;
			}
			break;
		case MeasureSpec.EXACTLY:
			result = specSize;
			break;
		}
		return result | (childMeasuredState&MEASURED_STATE_MASK);
	}

	/**
	 * 
	 * Resets the selector indices and clear the cached string representation of
	 * these indices.
	 */
	private void initializeSelectorWheelIndices() {
		mSelectorIndexToStringCache.clear();
		int[] selectorIndices = mSelectorIndices;
		int current = getValue();
		for (int i = 0; i < mSelectorIndices.length; i++) {
			int selectorIndex = current + (i - SELECTOR_MIDDLE_ITEM_INDEX);
			if (mWrapSelectorWheel) {
				selectorIndex = getWrappedSelectorIndex(selectorIndex);
			}
			selectorIndices[i] = selectorIndex;
			ensureCachedScrollSelectorValue(selectorIndices[i]);
		}
	}

	/**
	 * Sets the current value of this NumberPicker.
	 *
	 * @param current The new value of the NumberPicker.
	 * @param notifyChange Whether to notify if the current value changed.
	 */
	private void setValueInternal(int current, boolean notifyChange) {
		if (mValue == current) {
			return;
		}
		// Wrap around the values if we go past the start or end
		if (mWrapSelectorWheel) {
			current = getWrappedSelectorIndex(current);
		} else {
			current = Math.max(current, mMinValue);
			current = Math.min(current, mMaxValue);
		}
		int previous = mValue;
		mValue = current;
		updateInputTextView();
		if (notifyChange) {
			notifyChange(previous, current);
		}
		initializeSelectorWheelIndices();
		invalidate();
	}

	/**
	 * 对当前值加1或者减1.
	 * Changes the current value by one which is increment or
	 * decrement based on the passes argument.
	 * decrement the current value.
	 *
	 * @param increment True to increment, false to decrement.
	 */
	private void changeValueByOne(boolean increment) {
		//如果是滚动操作。
		if (mHasSelectorWheel) {
			mInputText.setVisibility(View.INVISIBLE);
			if (!moveToFinalScrollerPosition(mFlingScroller)) {
				moveToFinalScrollerPosition(mAdjustScroller);
			}
			mPreviousScrollerY = 0;
			if (increment) {
				mFlingScroller.startScroll(0, 0, 0, -mSelectorElementHeight, SNAP_SCROLL_DURATION);
			} else {
				mFlingScroller.startScroll(0, 0, 0, mSelectorElementHeight, SNAP_SCROLL_DURATION);
			}
			invalidate();
		} else {
			if (increment) {
				setValueInternal(mValue + 1, true);
			} else {
				setValueInternal(mValue - 1, true);
			}
		}
	}

	private void initializeSelectorWheel() {
		initializeSelectorWheelIndices();
		int[] selectorIndices = mSelectorIndices;
		int totalTextHeight = selectorIndices.length * mTextSize;
		float totalTextGapHeight = (getBottom() - getTop()) - totalTextHeight;
		float textGapCount = selectorIndices.length;
		mSelectorTextGapHeight = (int) ((totalTextGapHeight / textGapCount) + 0.5f);
		mSelectorElementHeight = mTextSize + mSelectorTextGapHeight;
		// Ensure that the middle item is positioned the same as the text in
		// mInputText
		int editTextTextPosition = mInputText.getBaseline() + mInputText.getTop();
		mInitialScrollOffset = editTextTextPosition
				- (mSelectorElementHeight * SELECTOR_MIDDLE_ITEM_INDEX);
		mCurrentScrollOffset = mInitialScrollOffset;
		updateInputTextView();
	}

	private void initializeFadingEdges() {
		setVerticalFadingEdgeEnabled(true);
		setFadingEdgeLength((getBottom() - getTop() - mTextSize) / 2);
	}

	/**
	 * Callback invoked upon completion of a given <code>scroller</code>.
	 */
	private void onScrollerFinished(Scroller scroller) {
		if (scroller == mFlingScroller) {
			if (!ensureScrollWheelAdjusted()) {
				updateInputTextView();
			}
			onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
		} else {
			if (mScrollState != OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
				updateInputTextView();
			}
		}
	}

	/**
	 * Handles transition to a given <code>scrollState</code>
	 */
	private void onScrollStateChange(int scrollState) {
		if (mScrollState == scrollState) {
			return;
		}
		mScrollState = scrollState;
		if (mOnScrollListener != null) {
			mOnScrollListener.onScrollStateChange(this, scrollState);
		}
	}

	/**
	 * Flings the selector with the given <code>velocityY</code>.
	 */
	private void fling(int velocityY) {
		mPreviousScrollerY = 0;

		if (velocityY > 0) {
			mFlingScroller.fling(0, 0, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE);
		} else {
			mFlingScroller.fling(0, Integer.MAX_VALUE, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE);
		}

		invalidate();
	}

	/**
	 * @return The wrapped index <code>selectorIndex</code> value.
	 */
	private int getWrappedSelectorIndex(int selectorIndex) {
		if (selectorIndex > mMaxValue) {
			return (mMinValue + ((selectorIndex - mMaxValue) % (mMaxValue - mMinValue))) - 1;
		} else if (selectorIndex < mMinValue) {
			return (mMaxValue - ((mMinValue - selectorIndex) % (mMaxValue - mMinValue))) + 1;
		}
		return selectorIndex;
	}

	/**
	 * Increments the <code>selectorIndices</code> whose string representations
	 * will be displayed in the selector.
	 */
	private void incrementSelectorIndices(int[] selectorIndices) {
		for (int i = 0; i < (selectorIndices.length - 1); i++) {
			selectorIndices[i] = selectorIndices[i + 1];
		}
		int nextScrollSelectorIndex = selectorIndices[selectorIndices.length - 2] + 1;
		if (mWrapSelectorWheel && (nextScrollSelectorIndex > mMaxValue)) {
			nextScrollSelectorIndex = mMinValue;
		}
		selectorIndices[selectorIndices.length - 1] = nextScrollSelectorIndex;
		ensureCachedScrollSelectorValue(nextScrollSelectorIndex);
	}

	/**
	 * Decrements the <code>selectorIndices</code> whose string representations
	 * will be displayed in the selector.
	 */
	private void decrementSelectorIndices(int[] selectorIndices) {
		for (int i = selectorIndices.length - 1; i > 0; i--) {
			selectorIndices[i] = selectorIndices[i - 1];
		}
		int nextScrollSelectorIndex = selectorIndices[1] - 1;
		if (mWrapSelectorWheel && (nextScrollSelectorIndex < mMinValue)) {
			nextScrollSelectorIndex = mMaxValue;
		}
		selectorIndices[0] = nextScrollSelectorIndex;
		ensureCachedScrollSelectorValue(nextScrollSelectorIndex);
	}

	/**
	 * Ensures we have a cached string representation of the given <code>
	 * selectorIndex</code> to avoid multiple instantiations of the same string.
	 */
	private void ensureCachedScrollSelectorValue(int selectorIndex) {
		SparseArray<String> cache = mSelectorIndexToStringCache;
		String scrollSelectorValue = cache.get(selectorIndex);
		if (scrollSelectorValue != null) {
			return;
		}
		if ((selectorIndex < mMinValue) || (selectorIndex > mMaxValue)) {
			scrollSelectorValue = "";
		} else {
			if (mDisplayedValues != null) {
				int displayedValueIndex = selectorIndex - mMinValue;
				scrollSelectorValue = mDisplayedValues[displayedValueIndex];
			} else {
				scrollSelectorValue = formatNumber(selectorIndex);
			}
		}
		cache.put(selectorIndex, scrollSelectorValue);
	}

	private String formatNumber(int value) {
		return (mFormatter != null) ? mFormatter.format(value) : formatNumberWithLocale(value);
	}

	private void validateInputTextView(View v) {
		String str = String.valueOf(((TextView) v).getText());
		if (TextUtils.isEmpty(str)) {
			// Restore to the old value as we don't allow empty values
			updateInputTextView();
		} else {
			// Check the new value and ensure it's in range
			int current = getSelectedPos(str.toString());
			setValueInternal(current, true);
		}
	}

	/**
	 * 
	 * 如果指定了 displayedValues，则显示对应的值，否则用{@link #setFormatter}
	 * 指定的格式化类来格式话数值
	 * 
	 * Updates the view of this NumberPicker. If displayValues were specified in
	 * the string corresponding to the index specified by the current value will
	 * be returned. Otherwise, the formatter specified in {@link #setFormatter}
	 * will be used to format the number.
	 *
	 * @return Whether the text was updated.
	 */
	private boolean updateInputTextView() {
		/*
		 * If we don't have displayed values then use the current number else
		 * find the correct value in the displayed values for the current
		 * number.
		 */
		/**
		 * 如果没有设置用于显示的值，就显示当前的数值。
		 */
		String text = (mDisplayedValues == null) ? formatNumber(mValue)
				: mDisplayedValues[mValue - mMinValue];
		if (!TextUtils.isEmpty(text) && !text.equals(mInputText.getText().toString())) {
			mInputText.setText(text);
			return true;
		}

		return false;
	}

	/**
	 * Notifies the listener, if registered, of a change of the value of this
	 * NumberPicker.
	 */
	private void notifyChange(int previous, int current) {
		if (mOnValueChangeListener != null) {
			mOnValueChangeListener.onValueChange(this, previous, mValue);
		}
	}

	/**
	 * Posts a command for changing the current value by one.
	 *
	 * @param increment Whether to increment or decrement the value.
	 */
	private void postChangeCurrentByOneFromLongPress(boolean increment, long delayMillis) {
		if (mChangeCurrentByOneFromLongPressCommand == null) {
			mChangeCurrentByOneFromLongPressCommand = new ChangeCurrentByOneFromLongPressCommand();
		} else {
			removeCallbacks(mChangeCurrentByOneFromLongPressCommand);
		}
		mChangeCurrentByOneFromLongPressCommand.setStep(increment);
		postDelayed(mChangeCurrentByOneFromLongPressCommand, delayMillis);
	}

	/**
	 * Removes the command for changing the current value by one.
	 */
	private void removeChangeCurrentByOneFromLongPress() {
		if (mChangeCurrentByOneFromLongPressCommand != null) {
			removeCallbacks(mChangeCurrentByOneFromLongPressCommand);
		}
	}

	/**
	 * Posts a command for beginning an edit of the current value via IME on
	 * long press.
	 */
	private void postBeginSoftInputOnLongPressCommand() {
		if (mBeginSoftInputOnLongPressCommand == null) {
			mBeginSoftInputOnLongPressCommand = new BeginSoftInputOnLongPressCommand();
		} else {
			removeCallbacks(mBeginSoftInputOnLongPressCommand);
		}
		postDelayed(mBeginSoftInputOnLongPressCommand, ViewConfiguration.getLongPressTimeout());
	}

	/**
	 * Removes the command for beginning an edit of the current value via IME.
	 */
	private void removeBeginSoftInputCommand() {
		if (mBeginSoftInputOnLongPressCommand != null) {
			removeCallbacks(mBeginSoftInputOnLongPressCommand);
		}
	}

	/**
	 * Removes all pending callback from the message queue.
	 */
	private void removeAllCallbacks() {
		if (mChangeCurrentByOneFromLongPressCommand != null) {
			removeCallbacks(mChangeCurrentByOneFromLongPressCommand);
		}
		if (mSetSelectionCommand != null) {
			removeCallbacks(mSetSelectionCommand);
		}
		if (mBeginSoftInputOnLongPressCommand != null) {
			removeCallbacks(mBeginSoftInputOnLongPressCommand);
		}
		mPressedStateHelper.cancel();
	}

	/**
	 * @return The selected index given its displayed <code>value</code>.
	 */
	private int getSelectedPos(String value) {
		if (mDisplayedValues == null) {
			try {
				return Integer.parseInt(value);
			} catch (NumberFormatException e) {
				// Ignore as if it's not a number we don't care
			}
		} else {
			for (int i = 0; i < mDisplayedValues.length; i++) {
				// Don't force the user to type in jan when ja will do
				value = value.toLowerCase();
				if (mDisplayedValues[i].toLowerCase().startsWith(value)) {
					return mMinValue + i;
				}
			}

			/*
			 * The user might have typed in a number into the month field i.e.
			 * 10 instead of OCT so support that too.
			 */
			try {
				return Integer.parseInt(value);
			} catch (NumberFormatException e) {

				// Ignore as if it's not a number we don't care
			}
		}
		return mMinValue;
	}

	/**
	 * Posts an {@link SetSelectionCommand} from the given <code>selectionStart
	 * </code> to <code>selectionEnd</code>.
	 */
	private void postSetSelectionCommand(int selectionStart, int selectionEnd) {
		if (mSetSelectionCommand == null) {
			mSetSelectionCommand = new SetSelectionCommand();
		} else {
			removeCallbacks(mSetSelectionCommand);
		}
		mSetSelectionCommand.mSelectionStart = selectionStart;
		mSetSelectionCommand.mSelectionEnd = selectionEnd;
		post(mSetSelectionCommand);
	}

	/**
	 * The numbers accepted by the input text's {@link Filter}
	 */
	private static final char[] DIGIT_CHARACTERS = new char[] {
		// Latin digits are the common case
		'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
		// Arabic-Indic
		'\u0660', '\u0661', '\u0662', '\u0663', '\u0664', '\u0665', '\u0666', '\u0667', '\u0668'
		, '\u0669',
		// Extended Arabic-Indic
		'\u06f0', '\u06f1', '\u06f2', '\u06f3', '\u06f4', '\u06f5', '\u06f6', '\u06f7', '\u06f8'
		, '\u06f9'
	};

	/**
	 * Filter for accepting only valid indices or prefixes of the string
	 * representation of valid indices.
	 */
	class InputTextFilter extends NumberKeyListener {

		// XXX This doesn't allow for range limits when controlled by a
		// soft input method!
		@Override
		public int getInputType() {
			return InputType.TYPE_CLASS_TEXT;
		}

		@Override
		protected char[] getAcceptedChars() {
			return DIGIT_CHARACTERS;
		}

		@Override
		public CharSequence filter(
				CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
			if (mDisplayedValues == null) {
				CharSequence filtered = super.filter(source, start, end, dest, dstart, dend);
				if (filtered == null) {
					filtered = source.subSequence(start, end);
				}

				String result = String.valueOf(dest.subSequence(0, dstart)) + filtered
						+ dest.subSequence(dend, dest.length());

				if ("".equals(result)) {
					return result;
				}
				int val = getSelectedPos(result);

				/*
				 * Ensure the user can't type in a value greater than the max
				 * allowed. We have to allow less than min as the user might
				 * want to delete some numbers and then type a new number.
				 */
				if (val > mMaxValue) {
					return "";
				} else {
					return filtered;
				}
			} else {
				CharSequence filtered = String.valueOf(source.subSequence(start, end));
				if (TextUtils.isEmpty(filtered)) {
					return "";
				}
				String result = String.valueOf(dest.subSequence(0, dstart)) + filtered
						+ dest.subSequence(dend, dest.length());
				String str = String.valueOf(result).toLowerCase();
				for (String val : mDisplayedValues) {
					String valLowerCase = val.toLowerCase();
					if (valLowerCase.startsWith(str)) {
						postSetSelectionCommand(result.length(), val.length());
						return val.subSequence(dstart, val.length());
					}
				}
				return "";
			}
		}
	}

	/**
	 * Ensures that the scroll wheel is adjusted i.e. there is no offset and the
	 * middle element is in the middle of the widget.
	 *
	 * @return Whether an adjustment has been made.
	 */
	private boolean ensureScrollWheelAdjusted() {
		// adjust to the closest value
		int deltaY = mInitialScrollOffset - mCurrentScrollOffset;
		if (deltaY != 0) {
			mPreviousScrollerY = 0;
			if (Math.abs(deltaY) > (mSelectorElementHeight / 2)) {
				deltaY += (deltaY > 0) ? -mSelectorElementHeight : mSelectorElementHeight;
			}
			mAdjustScroller.startScroll(0, 0, 0, deltaY, SELECTOR_ADJUSTMENT_DURATION_MILLIS);
			invalidate();
			return true;
		}
		return false;
	}

	class PressedStateHelper implements Runnable {
		public static final int BUTTON_INCREMENT = 1;
		public static final int BUTTON_DECREMENT = 2;

		private final int MODE_PRESS = 1;
		private final int MODE_TAPPED = 2;

		private int mManagedButton;
		private int mMode;

		public void cancel() {
			mMode = 0;
			mManagedButton = 0;
			NumberPicker.this.removeCallbacks(this);
			if (mIncrementVirtualButtonPressed) {
				mIncrementVirtualButtonPressed = false;
				invalidate(0, mBottomSelectionDividerBottom, getRight(), getBottom());
			}
			mDecrementVirtualButtonPressed = false;
			if (mDecrementVirtualButtonPressed) {
				invalidate(0, 0, getRight(), mTopSelectionDividerTop);
			}
		}

		public void buttonPressDelayed(int button) {
			cancel();
			mMode = MODE_PRESS;
			mManagedButton = button;
			NumberPicker.this.postDelayed(this, ViewConfiguration.getTapTimeout());
		}

		public void buttonTapped(int button) {
			cancel();
			mMode = MODE_TAPPED;
			mManagedButton = button;
			NumberPicker.this.post(this);
		}

		@Override
		public void run() {
			switch (mMode) {
			case MODE_PRESS: {
				switch (mManagedButton) {
				case BUTTON_INCREMENT: {
					mIncrementVirtualButtonPressed = true;
					invalidate(0, mBottomSelectionDividerBottom, getRight(), getBottom());
				} break;
				case BUTTON_DECREMENT: {
					mDecrementVirtualButtonPressed = true;
					invalidate(0, 0, getRight(), mTopSelectionDividerTop);
				}
				}
			} break;
			case MODE_TAPPED: {
				switch (mManagedButton) {
				case BUTTON_INCREMENT: {
					if (!mIncrementVirtualButtonPressed) {
						NumberPicker.this.postDelayed(this,
								ViewConfiguration.getPressedStateDuration());
					}
					mIncrementVirtualButtonPressed ^= true;
					invalidate(0, mBottomSelectionDividerBottom, getRight(), getBottom());
				} break;
				case BUTTON_DECREMENT: {
					if (!mDecrementVirtualButtonPressed) {
						NumberPicker.this.postDelayed(this,
								ViewConfiguration.getPressedStateDuration());
					}
					mDecrementVirtualButtonPressed ^= true;
					invalidate(0, 0, getRight(), mTopSelectionDividerTop);
				}
				}
			} break;
			}
		}
	}

	/**
	 * Command for setting the input text selection.
	 */
	class SetSelectionCommand implements Runnable {
		private int mSelectionStart;

		private int mSelectionEnd;

		@Override
		public void run() {
			mInputText.setSelection(mSelectionStart, mSelectionEnd);
		}
	}

	/**
	 * Command for changing the current value from a long press by one.
	 */
	class ChangeCurrentByOneFromLongPressCommand implements Runnable {
		private boolean mIncrement;

		private void setStep(boolean increment) {
			mIncrement = increment;
		}

		@Override
		public void run() {
			changeValueByOne(mIncrement);
			postDelayed(this, mLongPressUpdateInterval);
		}
	}

	/**
	 * @hide
	 */
	public static class CustomEditText extends EditText {

		public CustomEditText(Context context, AttributeSet attrs) {
			super(context, attrs);
		}

		@Override
		public void onEditorAction(int actionCode) {
			super.onEditorAction(actionCode);
			if (actionCode == EditorInfo.IME_ACTION_DONE) {
				clearFocus();
			}
		}
	}

	/**
	 * Command for beginning soft input on long press.
	 */
	class BeginSoftInputOnLongPressCommand implements Runnable {

		@Override
		public void run() {
			showSoftInput();
			mIngonreMoveEvents = true;
		}
	}

	private SupportAccessibilityNodeProvider getSupportAccessibilityNodeProvider() {
		return new SupportAccessibilityNodeProvider();
	}

	class SupportAccessibilityNodeProvider {

		AccessibilityNodeProviderImpl mProvider;

		private SupportAccessibilityNodeProvider() {
			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
				mProvider = new AccessibilityNodeProviderImpl();
			}
		}

		public boolean performAction(int virtualViewId, int action, Bundle arguments) {
			if (mProvider != null) {
				return mProvider.performAction(virtualViewId, action, arguments);
			}

			return false;
		}

		public void sendAccessibilityEventForVirtualView(int virtualViewId, int eventType) {
			if (mProvider != null) mProvider.sendAccessibilityEventForVirtualView(virtualViewId, eventType);
		}
	}

	/**
	 * Class for managing virtual view tree rooted at this picker.
	 */
	class AccessibilityNodeProviderImpl extends AccessibilityNodeProvider {
		private static final int UNDEFINED = Integer.MIN_VALUE;

		private static final int VIRTUAL_VIEW_ID_INCREMENT = 1;

		private static final int VIRTUAL_VIEW_ID_INPUT = 2;

		private static final int VIRTUAL_VIEW_ID_DECREMENT = 3;

		private final Rect mTempRect = new Rect();

		private final int[] mTempArray = new int[2];

		private int mAccessibilityFocusedView = UNDEFINED;

		@Override
		public AccessibilityNodeInfo createAccessibilityNodeInfo(int virtualViewId) {
			switch (virtualViewId) {
			case View.NO_ID:
				return createAccessibilityNodeInfoForNumberPicker( getScrollX(), getScrollY(),
						getScrollX() + (getRight() - getLeft()), getScrollY() + (getBottom() - getTop()));
			case VIRTUAL_VIEW_ID_DECREMENT:
				return createAccessibilityNodeInfoForVirtualButton(VIRTUAL_VIEW_ID_DECREMENT,
						getVirtualDecrementButtonText(), getScrollX(), getScrollY(),
						getScrollX() + (getRight() - getLeft()),
						mTopSelectionDividerTop + mSelectionDividerHeight);
			case VIRTUAL_VIEW_ID_INPUT:
				return createAccessibiltyNodeInfoForInputText();
			case VIRTUAL_VIEW_ID_INCREMENT:
				return createAccessibilityNodeInfoForVirtualButton(VIRTUAL_VIEW_ID_INCREMENT,
						getVirtualIncrementButtonText(), getScrollX(),
						mBottomSelectionDividerBottom - mSelectionDividerHeight,
						getScrollX() + (getRight() - getLeft()), getScrollY() + (getBottom() - getTop()));
			}
			return super.createAccessibilityNodeInfo(virtualViewId);
		}

		@Override
		public List<AccessibilityNodeInfo> findAccessibilityNodeInfosByText(String searched,
				int virtualViewId) {
			if (TextUtils.isEmpty(searched)) {
				return Collections.emptyList();
			}
			String searchedLowerCase = searched.toLowerCase();
			List<AccessibilityNodeInfo> result = new ArrayList<AccessibilityNodeInfo>();
			switch (virtualViewId) {
			case View.NO_ID: {
				findAccessibilityNodeInfosByTextInChild(searchedLowerCase,
						VIRTUAL_VIEW_ID_DECREMENT, result);
				findAccessibilityNodeInfosByTextInChild(searchedLowerCase,
						VIRTUAL_VIEW_ID_INPUT, result);
				findAccessibilityNodeInfosByTextInChild(searchedLowerCase,
						VIRTUAL_VIEW_ID_INCREMENT, result);
				return result;
			}
			case VIRTUAL_VIEW_ID_DECREMENT:
			case VIRTUAL_VIEW_ID_INCREMENT:
			case VIRTUAL_VIEW_ID_INPUT: {
				findAccessibilityNodeInfosByTextInChild(searchedLowerCase, virtualViewId,
						result);
				return result;
			}
			}
			return super.findAccessibilityNodeInfosByText(searched, virtualViewId);
		}

		@Override
		public boolean performAction(int virtualViewId, int action, Bundle arguments) {
			switch (virtualViewId) {
			case View.NO_ID: {
				switch (action) {
				case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
					if (mAccessibilityFocusedView != virtualViewId) {
						mAccessibilityFocusedView = virtualViewId;
						// requestAccessibilityFocus();
						performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
						return true;
					}
				} return false;
				case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: {
					if (mAccessibilityFocusedView == virtualViewId) {
						mAccessibilityFocusedView = UNDEFINED;
						// clearAccessibilityFocus();
						performAccessibilityAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS, null);
						return true;
					}
					return false;
				}
				case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
					if (NumberPicker.this.isEnabled()
							&& (getWrapSelectorWheel() || (getValue() < getMaxValue()))) {
						changeValueByOne(true);
						return true;
					}
				} return false;
				case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
					if (NumberPicker.this.isEnabled()
							&& (getWrapSelectorWheel() || (getValue() > getMinValue()))) {
						changeValueByOne(false);
						return true;
					}
				} return false;
				}
			} break;
			case VIRTUAL_VIEW_ID_INPUT: {
				switch (action) {
				case AccessibilityNodeInfo.ACTION_FOCUS: {
					if (NumberPicker.this.isEnabled() && !mInputText.isFocused()) {
						return mInputText.requestFocus();
					}
				} break;
				case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: {
					if (NumberPicker.this.isEnabled() && mInputText.isFocused()) {
						mInputText.clearFocus();
						return true;
					}
					return false;
				}
				case AccessibilityNodeInfo.ACTION_CLICK: {
					if (NumberPicker.this.isEnabled()) {
						showSoftInput();
						return true;
					}
					return false;
				}
				case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
					if (mAccessibilityFocusedView != virtualViewId) {
						mAccessibilityFocusedView = virtualViewId;
						sendAccessibilityEventForVirtualView(virtualViewId,
								AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
						mInputText.invalidate();
						return true;
					}
				} return false;
				case  AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: {
					if (mAccessibilityFocusedView == virtualViewId) {
						mAccessibilityFocusedView = UNDEFINED;
						sendAccessibilityEventForVirtualView(virtualViewId,
								AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
						mInputText.invalidate();
						return true;
					}
				} return false;
				default: {
					return mInputText.performAccessibilityAction(action, arguments);
				}
				}
			} return false;
			case VIRTUAL_VIEW_ID_INCREMENT: {
				switch (action) {
				case AccessibilityNodeInfo.ACTION_CLICK: {
					if (NumberPicker.this.isEnabled()) {
						NumberPicker.this.changeValueByOne(true);
						sendAccessibilityEventForVirtualView(virtualViewId,
								AccessibilityEvent.TYPE_VIEW_CLICKED);
						return true;
					}
				} return false;
				case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
					if (mAccessibilityFocusedView != virtualViewId) {
						mAccessibilityFocusedView = virtualViewId;
						sendAccessibilityEventForVirtualView(virtualViewId,
								AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
						invalidate(0, mBottomSelectionDividerBottom, getRight(), getBottom());
						return true;
					}
				} return false;
				case  AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: {
					if (mAccessibilityFocusedView == virtualViewId) {
						mAccessibilityFocusedView = UNDEFINED;
						sendAccessibilityEventForVirtualView(virtualViewId,
								AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
						invalidate(0, mBottomSelectionDividerBottom, getRight(), getBottom());
						return true;
					}
				} return false;
				}
			} return false;
			case VIRTUAL_VIEW_ID_DECREMENT: {
				switch (action) {
				case AccessibilityNodeInfo.ACTION_CLICK: {
					if (NumberPicker.this.isEnabled()) {
						final boolean increment = (virtualViewId == VIRTUAL_VIEW_ID_INCREMENT);
						NumberPicker.this.changeValueByOne(increment);
						sendAccessibilityEventForVirtualView(virtualViewId,
								AccessibilityEvent.TYPE_VIEW_CLICKED);
						return true;
					}
				} return false;
				case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
					if (mAccessibilityFocusedView != virtualViewId) {
						mAccessibilityFocusedView = virtualViewId;
						sendAccessibilityEventForVirtualView(virtualViewId,
								AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
						invalidate(0, 0, getRight(), mTopSelectionDividerTop);
						return true;
					}
				} return false;
				case  AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: {
					if (mAccessibilityFocusedView == virtualViewId) {
						mAccessibilityFocusedView = UNDEFINED;
						sendAccessibilityEventForVirtualView(virtualViewId,
								AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
						invalidate(0, 0, getRight(), mTopSelectionDividerTop);
						return true;
					}
				} return false;
				}
			} return false;
			}
			return super.performAction(virtualViewId, action, arguments);
		}

		public void sendAccessibilityEventForVirtualView(int virtualViewId, int eventType) {
			switch (virtualViewId) {
			case VIRTUAL_VIEW_ID_DECREMENT: {
				if (hasVirtualDecrementButton()) {
					sendAccessibilityEventForVirtualButton(virtualViewId, eventType,
							getVirtualDecrementButtonText());
				}
			} break;
			case VIRTUAL_VIEW_ID_INPUT: {
				sendAccessibilityEventForVirtualText(eventType);
			} break;
			case VIRTUAL_VIEW_ID_INCREMENT: {
				if (hasVirtualIncrementButton()) {
					sendAccessibilityEventForVirtualButton(virtualViewId, eventType,
							getVirtualIncrementButtonText());
				}
			} break;
			}
		}

		private void sendAccessibilityEventForVirtualText(int eventType) {
			if (((AccessibilityManager) getContext().getSystemService(Context.ACCESSIBILITY_SERVICE)).isEnabled()) {
				AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
				mInputText.onInitializeAccessibilityEvent(event);
				mInputText.onPopulateAccessibilityEvent(event);
				event.setSource(NumberPicker.this, VIRTUAL_VIEW_ID_INPUT);
				requestSendAccessibilityEvent(NumberPicker.this, event);
			}
		}

		private void sendAccessibilityEventForVirtualButton(int virtualViewId, int eventType,
				String text) {
			if (((AccessibilityManager) getContext().getSystemService(Context.ACCESSIBILITY_SERVICE)).isEnabled()) {
				AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
				event.setClassName(Button.class.getName());
				event.setPackageName(getContext().getPackageName());
				event.getText().add(text);
				event.setEnabled(NumberPicker.this.isEnabled());
				event.setSource(NumberPicker.this, virtualViewId);
				requestSendAccessibilityEvent(NumberPicker.this, event);
			}
		}

		private void findAccessibilityNodeInfosByTextInChild(String searchedLowerCase,
				int virtualViewId, List<AccessibilityNodeInfo> outResult) {
			switch (virtualViewId) {
			case VIRTUAL_VIEW_ID_DECREMENT: {
				String text = getVirtualDecrementButtonText();
				if (!TextUtils.isEmpty(text)
						&& text.toString().toLowerCase().contains(searchedLowerCase)) {
					outResult.add(createAccessibilityNodeInfo(VIRTUAL_VIEW_ID_DECREMENT));
				}
			} return;
			case VIRTUAL_VIEW_ID_INPUT: {
				CharSequence text = mInputText.getText();
				if (!TextUtils.isEmpty(text) &&
						text.toString().toLowerCase().contains(searchedLowerCase)) {
					outResult.add(createAccessibilityNodeInfo(VIRTUAL_VIEW_ID_INPUT));
					return;
				}
				CharSequence contentDesc = mInputText.getText();
				if (!TextUtils.isEmpty(contentDesc) &&
						contentDesc.toString().toLowerCase().contains(searchedLowerCase)) {
					outResult.add(createAccessibilityNodeInfo(VIRTUAL_VIEW_ID_INPUT));
					return;
				}
			} break;
			case VIRTUAL_VIEW_ID_INCREMENT: {
				String text = getVirtualIncrementButtonText();
				if (!TextUtils.isEmpty(text)
						&& text.toString().toLowerCase().contains(searchedLowerCase)) {
					outResult.add(createAccessibilityNodeInfo(VIRTUAL_VIEW_ID_INCREMENT));
				}
			} return;
			}
		}

		private AccessibilityNodeInfo createAccessibiltyNodeInfoForInputText() {
			AccessibilityNodeInfo info = mInputText.createAccessibilityNodeInfo();
			info.setSource(NumberPicker.this, VIRTUAL_VIEW_ID_INPUT);
			if (mAccessibilityFocusedView != VIRTUAL_VIEW_ID_INPUT) {
				info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
			}
			if (mAccessibilityFocusedView == VIRTUAL_VIEW_ID_INPUT) {
				info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
			}
			return info;
		}

		private AccessibilityNodeInfo createAccessibilityNodeInfoForVirtualButton(int virtualViewId,
				String text, int left, int top, int right, int bottom) {
			AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain();
			info.setClassName(Button.class.getName());
			info.setPackageName(getContext().getPackageName());
			info.setSource(NumberPicker.this, virtualViewId);
			info.setParent(NumberPicker.this);
			info.setText(text);
			info.setClickable(true);
			info.setLongClickable(true);
			info.setEnabled(NumberPicker.this.isEnabled());
			Rect boundsInParent = mTempRect;
			boundsInParent.set(left, top, right, bottom);
			// TODO info.setVisibleToUser(isVisibleToUser(boundsInParent));
			info.setBoundsInParent(boundsInParent);
			Rect boundsInScreen = boundsInParent;
			int[] locationOnScreen = mTempArray;
			getLocationOnScreen(locationOnScreen);
			boundsInScreen.offset(locationOnScreen[0], locationOnScreen[1]);
			info.setBoundsInScreen(boundsInScreen);

			if (mAccessibilityFocusedView != virtualViewId) {
				info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
			}
			if (mAccessibilityFocusedView == virtualViewId) {
				info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
			}
			if (NumberPicker.this.isEnabled()) {
				info.addAction(AccessibilityNodeInfo.ACTION_CLICK);
			}

			return info;
		}

		private AccessibilityNodeInfo createAccessibilityNodeInfoForNumberPicker(int left, int top,
				int right, int bottom) {
			AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain();
			info.setClassName(NumberPicker.class.getName());
			info.setPackageName(getContext().getPackageName());
			info.setSource(NumberPicker.this);

			if (hasVirtualDecrementButton()) {
				info.addChild(NumberPicker.this, VIRTUAL_VIEW_ID_DECREMENT);
			}
			info.addChild(NumberPicker.this, VIRTUAL_VIEW_ID_INPUT);
			if (hasVirtualIncrementButton()) {
				info.addChild(NumberPicker.this, VIRTUAL_VIEW_ID_INCREMENT);
			}

			info.setParent((View) getParentForAccessibility());
			info.setEnabled(NumberPicker.this.isEnabled());
			info.setScrollable(true);

			/** TODO: Figure out compat implementation for this
            final float applicationScale =
                    getContext().getResources().getCompatibilityInfo().applicationScale;

            Rect boundsInParent = mTempRect;
            boundsInParent.set(left, top, right, bottom);
            boundsInParent.scale(applicationScale);
            info.setBoundsInParent(boundsInParent);

            info.setVisibleToUser(isVisibleToUser());

            Rect boundsInScreen = boundsInParent;
            int[] locationOnScreen = mTempArray;
            getLocationOnScreen(locationOnScreen);
            boundsInScreen.offset(locationOnScreen[0], locationOnScreen[1]);
            boundsInScreen.scale(applicationScale);
            info.setBoundsInScreen(boundsInScreen);
			 */

			if (mAccessibilityFocusedView != View.NO_ID) {
				info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
			}
			if (mAccessibilityFocusedView == View.NO_ID) {
				info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
			}
			if (NumberPicker.this.isEnabled()) {
				if (getWrapSelectorWheel() || (getValue() < getMaxValue())) {
					info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
				}
				if (getWrapSelectorWheel() || (getValue() > getMinValue())) {
					info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
				}
			}

			return info;
		}

		private boolean hasVirtualDecrementButton() {
			return getWrapSelectorWheel() || (getValue() > getMinValue());
		}

		private boolean hasVirtualIncrementButton() {
			return getWrapSelectorWheel() || (getValue() < getMaxValue());
		}

		private String getVirtualDecrementButtonText() {
			int value = mValue - 1;
			if (mWrapSelectorWheel) {
				value = getWrappedSelectorIndex(value);
			}
			if (value >= mMinValue) {
				return (mDisplayedValues == null) ? formatNumber(value)
						: mDisplayedValues[value - mMinValue];
			}
			return null;
		}

		private String getVirtualIncrementButtonText() {
			int value = mValue + 1;
			if (mWrapSelectorWheel) {
				value = getWrappedSelectorIndex(value);
			}
			if (value <= mMaxValue) {
				return (mDisplayedValues == null) ? formatNumber(value)
						: mDisplayedValues[value - mMinValue];
			}
			return null;
		}
	}

	static private String formatNumberWithLocale(int value) {
		return String.format(Locale.getDefault(), "%d", value);
	}
}
